Search strategy
Two researchers (YQY and XC) systematically searched PubMed, Embase, the
Cochrane Library, CINAHL, and three additional Chinese literature
databases, namely, CNKI, CBM and WanFang databases from inception to 25
June 2021 using a comprehensive search strategy (Appendix S1). We also
searched ClinicalTrials.gov to identify ongoing or unpublished eligible
trials. Additionally, reference lists of included articles and
relevant systematic reviews were
also screened.